A shameless couple threw decency to the wind and engaged in a sex act on a coach in front of shocked fellow travelers.

The couple did not even make any effort to hide what they were doing on the bus as it sped down a motorway in Fife, Scotland.

In a clip shared online, the woman can be seen on her knees performing a sex act on the man who has his trousers around his ankles.

They are in full view of other passengers and passing traffic.

The 18-year-old student who took the video told The Sun: “It still hasn’t sunk in what I’ve seen.”

“I stood up to move and just looked down to see a woman between this man’s knees. I couldn’t believe my eyes. They didn’t seem to care that there were other people around or that kids might see them.”

"What happened to public propriety in this catholic country?"

If you ask me, na who I go ask....